How to create realistic powder?
You have two solutions :

1- Use the game engine to make powder fall and after save the last frame. You can modelise each particule of pownder as a tiny cube for example, but it won't give you a result that is graphically appealling. 

2- If you want to have a result that looks exactly like the image you posted you need to sculpt because of the special pattern that there is on the image.